Fully agree with CF's comments.
One extra point - even if it is physically possible to plug in a faster CPU, it may overload the power supply and/or cause the Laptop to overheat - faster CPUs take more power and generate more heat, and laptops are usually designed with the bare minimum power supply / cooling capacity to maximise battery life.
I'm not familiar with your particular model of laptop, so I don't know if this is a problem ore not, but please check before proceeding.